Thermostat.



H. J. CARMODY.

THERMOSTAT.

APPLICATION FILED NOV. 16. 1915.

1 ,21 8 1 67 Patented Mar. 6, 1917.

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ATTORNEY UNITED STATES P TENT OFFICE.

HAROLD J. cARMonY, or BROOKLYN, New YoRK, ASSIGNOR or own-THIRD T0 Imsnrn M. LEVINE AND ONE-THIRD 'ro HARRY IIFLANZD, sort; or NEW YoRK, N.

THERmos'rA'r.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed November 16, 1915. Serial 170. 61,850. I

To all whom it may concern:

Be it known that I, HAROLD- J CARMODY, a citizen of the Unite? States, residing at New York, borough 0 Brooklyn, in the county of-Kings and State of New York, have invented certain new and useful Improvements in Thermostats, of which the following is a full, clear, and exact descripion. 1 I

My invention relates to thermostats, my more particular purpose being to group the various parts of the thermostatic mechanism into compact-form and to give them such appropriate shapes as.to facilitate their use, collectively,.as a single small article of manufacture, easily placed in position where it s to be used, and possessing many advan-.

I tages.

While my thermostat admits of general use, it is especially adapted for service upon automobile radiators and analogous structures. w

Reference is made to the accompanying drawing forming apart of this specification, and inwhich like letters indicate like parts in all of the figures.

Figure 1 is an elevation of a radiator upon which one of my improved thermostats is mounted.

Fig. 2 is a fragmentary view partly broken away and .partly in section, showing the thermostatic mechanism supported upon the radiator.

Fig. 3 is a view of thethermostat and is partly inelevation and partly broken away. Fig. 4: is a substantially central section through the mechanism of the thermostat.

Fig. 5 is a fragmentary section through the casing, and showsflthe gearing of thermostatic mechanism. Fig. 6 is a section on the line 6-6 of Fig.

4, looking in the direction of the arrows.

Fig. 7 is a fragmentary section, showing in detail the manner in which the thermostatic springs are each secured to the shaft. Fig. 8 is a section on line 88 ofFig. 3. Y

" The-body of a radiator is shown at 8, and

at 9 appears the radiator shell. The casing A "of the thermostat is shown at 10, and has {592;11116; generalproximate form of a sector. Se-

sang to the casing 10 is a tubular member 11, provided with perforations 12 and'thus having aforaminous form. This tubular I member 11 is provided with a closed end 13, and because of its function is designated as an armor tube. The armor'tube' is provided with a threaded portion 1 10f greater diamthis purpose the'casing is merely turned, so as to 'rotate the armor tube and parts carried. within it, the threaded portion 14 serving the purpose of a screw.

Disposed concentrically within the armor tube 11 and concentrically fitting closely within the same is a tubular barrel 18, provided with a head 19- and secured rigidly to the casing 10. Located within the barrel 18 and extending across the same at a point near the head 19 is a cross bar 20, serving as a bearing. A' shaft 21 extends axially into the barrel 18, and is provided with areduced portion 22 extending through a hole 'in the cross bar and serving as a journal neck. The casing 10 is provided with a palr of journal plates 23,. 24, disposed parallel with each other. "The shaft 21 extends through a hole in the plate 23, and is provided with a reduced portion 25 which serves as a journal neck, and extends through a hole in the plate 24.

Mounted rigidly upon the shaft 21 is a gear wheel 26, and meshing withthis gear wheel is a pinion 27 which is mounted mgidly upon a stub shaft 28. This shaft extends through holes in the journal plates 23 and 24:. A pointer 29 is provided with a collar portion 30, which is secured rigidly upon the stub shaft 28, so that the pointer is moved angularly around as the stub shaft 28is rocked.

A number of composite strips 31, are each made of steel and brass or of any other two metals in which the coeificient'of thermal expansion is different. These strips are each coiled into helical form as shown. Each strip is providedwith a straight end por-*- tion 32, which extends diametrically through a slot in the shaft 21, as shown in Fig. 7.

Each strip is also provided with an end portion 33, which extends tangentially outward through a slot in the wall of the barrel 18- cooled, andthe pointer 29, by virtue of the ratio of the gearing contracting it, is caused to rock slowly within reasonable limits.

The casing 10 is provided with a back plate 33 and with a front plate 34, the front plate being held in position by screws 35..

The front plate carries aflange" 36 which is bent slightly outward and overlaps the An insulated wire 48-extends from the.

edges of a glass of a window. Extending through oppositely disposed portions of the wall of the casing 10 are a pair of sleeves 38, 39 of insulating material, preferably fiber or hard rubber. Extending through these sleeves are two screws 40, 41. Revolubly mounted upon the screw 40 and adapted to abut the ends of the sleeve 38 are two nuts 42, 43. Similarly the screw plate 37 serving the purpose 41 carries two nuts 44, 45 revolubly mounted upon it and adapted to abut the ends of the sleeve 39. The screws 40 and 41 are thus each adjustable in the direction of its'own length. Spring contact members 46, 47, each having substantially a V-form, are carried by the screws 40, 4'1, and located upon the ends thereof extending within the casing.

Disposed adjacent the contact member 46 and 47 are legends HeatBoiling and Cold'Freezing, together'with two arrows, the purpose of all of which is to assist the operator in ascertaining the position of the pointer 29 and the direction of its travel at any particular. instant.

screw 40 to the screw 41, ,and connected to the screw 41 is another insulated wire 49,.

An insulated wire 50 is connected directly.

to the casing 10. Whenever the pointer 29 comes into engagement with either contact member 46 or 47 an electric circuit is completed in the usual or any desired manner, and this electric circuit may include any convenient alarm mechanism adapted to be operated by an electric current.

In the particular device here illustrated, I

showthree of the helical strips 31. .This

the shaft 21 as indicated in Fig. 7 and as above described. The shaft 21, carryingthe composite strips, is thrust into the barrel 18 and the reduced portion 22 is guided through the hole in the cross bar, as shown in,,Fig. 4.

. Then the outer or free ends of the composite strips are brought out through holes in the wall of the barrel and soldered, as indicated in Fig. 6. The gear wheel 26 is placed within the casin '10, between the journal-plates 23, 24, an the free end of the shaft 21 is thrust through the gear wheel 26 and the journal" plates. 4 'The barrel 18 is next brazed or soldered upon the casing 10 and the armor tube 11 is next slipped over the barrel, spaced concentric to the latter, andbrazed or soldered to the casing. The various other parts are addedin any manner .desired, no special skill being requisite'for this purpose.

The operation of my device is as follows :The parts being assembled and arranged as described, and the wires 49, 50 being connected with a source of electricity and with an alarm, the mechanism is ready for use. Normally the position of the pointer 29 somewhere between thecontact members 46 and 47. Owing to variations in temperature, to which the radiator 9 may be. subjected, however, the pointer may be brought into engagement with one or the other of the contactmembers 46, 47, so as to complete theelectric circuit and actuate the alarm. Theparts are so proportioned and arranged that when w the barrel-18 and parts connected with it are subjected to a heat equal to that of boiling water, the pointer engages the contact member 46, but if the temperature of the barrel and parts connected with it doe' lowered to the freezing point of water, the pointer is brought into engagement with the contact member 47 The foraminous' character of the armor tube 11 promotes access, to the barrel 18,

of steam'or water, as the case may be, contained within the radiator. -The barrel 18 is both water tight and steam tight.

I do not limit myself to the exact construction shown, as variations may be made therefrom without departing from the spirit of my invention, the scope of which is commensurate with my claims In a thermostat the combination of a casing, indicating mechanism mounted within said casing, a steam-tight barrel secured to.

said casing and adaptedto extend into a radiator so as to support said casinga revoluble shaft connectedto said indicating mech- I 131mm? anism for the purpose of actuating the same, said shaft extending from said easing into said barrel, and a plurality of separate strips located within sald barrel, each strip being connected at one of its ends to said shaft and at the other of its ends to said'barrel,

equidistant in order'to equalize the efiect of the heat at different points within said barrel.

In testimony whereof, I have signed my name to this specification. I

HAROLD J. 'c'AnMonY. 

